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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4430c646caed2aab6492dac61414456e97a04d5caa860557015ea08b76e01837' 
  AND token = 'pIxVLTCWx+dDJ+/4sqrD04V7g3R8ELNHWae5mTQYV/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}